Container coatings



Patented .Iuly 5,

CONTAINER cosmos William J. Tomsioek, St. Paul, Minn, Lloyd L.

Dodge, Rhinelander, Wis., St. Paul, Minn assignors,

and Jose B. Calva, by direct and mesne assignments, to Dodge Chemicaland Manufacturing Company, Chicago, Ill., a corporation of Delaware NoDrawing. Application August 15, 1934, Serial No. 739,925

3 Claims. Our invention relates to an improvement in v containercoatings, and is particularly designed to preserve metallic and woodencontainers and to avoid the contamination of stored liquids by the innersurface of the container.

, It is common practice to employ pitch as a coating for kegs andvessels used for the storage of liquids, particularly in the brewingindustry.

This pitch may comprise anything from rosin to asphalt. This pitchcoating is undesirable for a plurality of reasons.

tainer surface. Furthermore, the high temperatures necessary'in theapplication of this pitch often injurethe chemical structure of thecoat- Our coating has the advantages of better adhe'sion to thecontainer, thus greatly diminishing the chances of having the coatingseparate from the container surface, exposing this container surface tothe liquid stored. Our coating is designed to adhere more firmly thanthe usual pitch coating to both wood and metal surfaces.

Our coating has higher moisture-proofing qualities than theusualpitch-coating, thus obviating through the coating into contact with thesurface of the container. Moreover, our coating is provided greaterplasticity, thus virtually obviating any chipping or cracking of thecoating. As a result, once a container is coated it is virtually 1impossible for stored liquid to contact the surface of the container.

' It is also a feature of our coating that lower temperatures arerequired to melt the coating, thereby-avoiding excessive heating of thecompo sition, which is apt to produce a chemical cracking and give riseto water soluble products which will contaminate aqueous solutions suchas beer.-

It is an added feature of our invention that no solvent is required toevaporate; Our coating is applied by means of a standard keg coatingequipment, or by spraying or painting. The coating is thus particularlyadapted for use in'coating wooden or steel kegs used in the brewingindustry. I

have described the principles of our composition for coating containers,and while we have en- The coating of our invention consists in mixturesof resinous substances. waxy substances,

and suitable hydrocarbons to obtain the desired results. I r

Ingeneral, our formula is as follows:

; I Per cent Resins 41 to 99 Waxes I lto 59 Hydrocarbons 1 to 59 Itoften contains impurities .to .injure the liquid stored in thecontainer.' Pitch often chips or cracks oil, exposing the con- (c1.air-es) By resins, we mean natural substances such as gum thus, copal,dammar, kauri, mastic and other similar substances; and synthetic sub-"stances such as ester gum, chlorinated-aromatic hydrocarbons such aschlorinated biphenyl, polymerized turpenes, phenol-formaldehyde resinsmodified by fatty-acids and mixed with rosin and rosin derivatives suchas ester gum, the glyceride of abietic acid such as the Amberols, theAlbertols, Bakesite, Paranol, which are trade names of substancesdescribed in German Patents 254,111; 269,659; 281,939; 289,968, and438,371, and resinous and waxy metallic substances such as the metallicderivatives of organic acids such as abietic, stearic and the like.

By waxes, we mean natural waxes such as 'Japan wax, beeswax,ceresin,.and synthetic waxes such as Rilan wax, and waxy substances suchas stearyl alcohol, stearic acid and similar substances; These waxes aresoft with relation to carnauba wax and provide a pliable coating.

By hydrocarbons, we mean substances such as petrolatum, and the like.

The'general formula and the usual limits of the ingredients used thereinhave been stated. A

specific example of a formula containing the neothe danger of having thestored liquid work essary ingredients in the desired amounts would be asfollows:-

Container coating:

Japan wax and petrolatum are natural prodgum is the deavored to setforth the best embodiment thereof; we desire'to have it understood thatthe formula may be changed within the scope of the following claimswithout departing from the spirit of the invention.

We claim: 1. In combination with a base, a coating comamaua tor,comprising substantially ester 65%. cereain 11%, and petrolatum 24%.

wmnu J. ToMsmEK. LLOYD L. DODGE.

JOSE B. can.

